Hytera S1/S1 LF two-way radios (HYT-S31 and HYT-S31 LF models)

specifications of the S1/S1 LF two-way radios (models HYT-S31 and HYT-S31 LF) from Hytera, which are designed to meet the needs of professionals in terms of reliable, durable and efficient communication.

1. General Features :

• Model :
  • HYT-S31 (standard version)
  • HYT-S31 LF (low-frequency version, specifically designed to operate on the 446 MHz band)
• Frequency Range :
  • HYT-S31 : 400-470 MHz (for the main unit), which is the most common range for VHF/UHF radio communication, suitable for many types of professional environments.
  • HYT-S31 LF : 446 MHz (a subset of UHF, particularly used for professional applications or in geographic areas where this frequency is authorized for license-free use).
• Channel Capacity :
  • 48 programmable channels, allowing flexible management of communication across different groups or areas in a dynamic professional environment.
• Zone Capacity :
  • 3 zones for organizing channels, allowing even more customized and efficient management of communications across various departments or groups within the company.
• Channel Spacing :
  • 12.5 kHz, 20 kHz and 25 kHz, allowing the user to select the frequency spacing that meets their specific needs in terms of communication quality and radio network density. These options offer the flexibility to adapt to local regulations or capacity requirements.
• Operating Voltage :
  • 3.8V (nominal voltage), which is standard in modern communication devices, ensuring consistent performance across a wide range of temperatures.
• Battery :
  • 2200 mAh Li-Polymer (lithium-polymer battery), offering excellent battery life while being lightweight and safer than other battery types. This battery is also durable and helps reduce the overall weight of the device without compromising its performance.

2. Battery Life (Based on a 5/5/90 duty cycle) :

Battery life varies depending on the selected transmission power and usage conditions. The following values are based on typical use according to the 5/5/90 duty cycle (5% transmission, 5% reception, 90% standby).

• 15 hours at 3W (maximum transmit power), offering sufficient battery life for a typical workday in environments where constant communication is required.
• 22 hours at 1W, ideal for less frequent communications or in environments requiring less transmit power while maintaining good range.
• 27 hours at 0.5W, for extended communication with low power consumption, perfect for environments where the radio is mainly in standby.

3. Frequency Stability :

• ±2 ppm (parts per million), which means that the radio frequency is extremely stable, even under varying temperatures. This ensures reliable communications across a wide range of conditions, without interference due to frequency drift.

4. Antenna :

• Antenna impedance :
  • 50 Ω, standard for VHF/UHF radio antennas. This allows good transmission and reception of signals with low loss, ensuring clear and reliable communication over long distances.

5. Dimensions and Weight :

• Dimensions (HxWxD) :
  • 108 x 53 x 20 mm (without antenna). These dimensions make the radio compact and easy to carry, while still being large enough to ensure a comfortable grip and good visibility of the buttons.
• Weight :
  • 145 g with battery, antenna and belt clip, which remains relatively light for a robust radio with long battery life.
  • 135 g without belt clip, offering an even lighter device for more mobile use.

6. Environment and Durability :

• Weather and wear resistance :
  • Compliance with IP67 standard (protection against dust and immersion in water up to 1 meter deep for 30 minutes). This certification guarantees that the radio can be used in harsh environments, including rain or dusty conditions, making it an excellent choice for outdoor and industrial work environments.
• Shock and drop tests :
  • The radio is designed to withstand accidental shocks and drops. This allows safe use in environments where the radio may be accidentally bumped or dropped, without affecting its performance.

7. Other Features :

• Transmit power adjustment :
  • The user can choose between different power levels (up to 3W), allowing the radio range to be adapted to the specific needs of each radio situation.
• Status indicators :
  • The radio is equipped with indicator lights that allow quick checking of battery status, signal reception and transmission activity.
• Accessory compatibility :
  • The radio model is compatible with external accessories, such as earpieces, external microphones and charging stations, allowing customization according to the user’s and the environment’s needs.